12.Without artificial help,DR can direct transform the X-ray passing through patients into digital images, save and display them in the computer.

31.Magnetic fields can be produced either by electromagnets or by permanent magnets .

14.Stable output with less noise and ripple can be obtained under all radiographic conditions because a high-frequency inverter is used .

25.However, for a scanner that dose not have 24/7 cooling , gantry power must be turned off (using the On/Off switch on the control panel ) when cooling is not available.

47.The client fills in the C-FIND request message with the keys that should be matched. E.g. the patient ID.

28.To tilt the gantry forward(+) or backward(-),press the respective buttons on the gantry panel.The tilt range is from -30 to +30 degrees .Zero(0) indicate that the gantry is in the vertical position.

15.Preventive maintenance is a necessary to ensure the safety and performance of the system.

23.Mental objects include jewelry,eyeglasses, dentures and hairpins may affect the CT images and should be left at home or removed prior to your exam. You may be asked to remove hearing aids and removable dental work.

52.DICOM differs from some, but not all, data formats in that it groups information into data sets. That means that a file of a chest X-ray image, for example, actually contains the patient ID within the file, so that the image can never be separated from this informatio by mistake.

9.Although there are great differences among diagnostic X-ray machines for different diagnostic objectives,the fundamental structure of X-ray machines is similar ,which consists of X-ray generating device,X-ray imaging device and X-ray auxiliary device.